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MINI Cooper S Turbo Upgrade Kit offers BIG Power without sacrificing reliability. Turbo upgrade and Hi-Flow Induction Kit for 2nd generation 2007-2010 MINI Cooper S models including R56 Hardtop R55 Clubman R57 Convertible
Turbo Upgrade Kit MINI Cooper S R55 R56 R57 Gen2 2007-2010

Turbo Upgrade Kit MINI Cooper S R55 R56 R57 Gen2 2007-2010

Turbo Upgrade Kit MINI Cooper S R55 R56 R57 Gen2 2007-2010

Turbo Upgrade Kit MINI Cooper S R55 R56 R57 Gen2 2007-2010

Turbo Upgrade Kit MINI Cooper S R55 R56 R57 Gen2 2007-2010

Turbo Upgrade Kit MINI Cooper S R55 R56 R57 Gen2 2007-2010

Turbo Upgrade Kit MINI Cooper S R55 R56 R57 Gen2 2007-2010
Selected: 2007-2010
Part No: G2NMK2620
This item is not available.
Specially Priced. Discounts Do Not Apply.
This Item has a $250.00 core charge.
Fits the following:
MINI (2002-Current)
Select variations below for more information:

MINI Cooper Turbo Upgrade kit includes the powerful and cost effective Refurbished K03 Quickspool Turbo upgrade along with the recommended complementary upgrades plus a Turbo Install Kit.  These kits allows you to install a performance turbo with the basic recommended upgrades on a stock MINI as a 'starter kit' with potential for further upgrades down the road.   Customers typically see a 30-40 hp increase with this kit.   

Fits the following models:

2007-2010 R56 MINI Cooper S Hardtop
2008-2010 R55 MINI Cooper S Clubman
2009-2010 R57 MINI Cooper S Convertible 

The 'correct' way to install an upgraded Turbo involves more than dropping in a larger turbo.  There are related upgrades that are necessary for fitment, turbo longevity, and engine efficiency.  This kit addresses all of these issues by including all the recommended parts to make the installation go smoothly and get the best results without going overboard with upgrades.  Yes, you can get more performance if you add more upgraded parts, but his kit gets you started - with reliability.

Kit includes:

  • Intake upgrade - to ensure adequate air intake and compatibility with the larger turbo inlet.
  • Refurbished K03 Quick Spool Turbo - for maximum value, excellent power gains, and streetability.
  • ECU Software upgrade - to help maximize the turbo's increased capacity.
  • Dowpipe Refurbish service - to ensure turbo longevity by removing excess backpressure from years of contamination in the catalytic converter.
  • Basic Turbo Install Kit - includes:
    • Oil Supply Line
    • Gaskets for Oil Supply Line (x4)
    • O-Ring for Oil Return Line
    • Gaskets for Coolant Lines (x4)
    • Seal for Turbo to Exhaust Manifold
    • Gasket for Turbo to Downpipe

NOTES:  Both the ECU Software Upgrade and Downpipe Refurbish service requires these items from your MINI to be shipped to the supplier.  The supplier will upgrade the software in YOUR ECU and refurbish YOUR Downpipe before returning them to you.  There is a refundable Core charge for the turbo - see CORE DEPOSIT note below.  


The heart of this upgrade kit is the K03 Quick Spool Turbo. Borg Warner supplies their K03 Turbocharger units to MINI for these models. This unit is the same Borg Warner units that has been refurbished and upgraded. Refurbished units are used units that have been completely overhauled including replacement of all internal wearable items such as Turbine Shaft Bearings and Steel Thrust Plates. After the rebuild all internal components are triple balanced which is one step better then the manufacturer's dual balance process. Any components that do not meet JMTC's stringent standards will be replaced. Some parts that are damaged beyond repair may be replaced with JMTC parts but will retain the full One Year Limited Warranty.

The refurbished units are thoroughly cleaned and rebuilt, but if you are concerned with some minor cosmetic scratches, minor dents, and other imperfections from previous use, choose the new units.  Functionally, the refurbished units perform just like the new units.

The MINI's factory K03 turbocharger with the 37mm compressor and 'some' mods can produce 17psi from about 1500rpm to about 3800rpm. But when you reach 4800rpm your torque will drop off because the boost has dropped to 13psi. Once you reach 5400 rpm you are down to about 7-8psi which cuts your torque in half . The 37mm stock K03 turbo is optimized for the average commuter type driver and NOT designed to give you boost throughout the entire RPM range. If you are on the track or strip it will feel like the car is loosing power when you need it most.

The K03 Quick Spool Turbo is built with larger compressor, upgraded internals, and a 360deg thrust bearing to handle high boost pressures.  The innovative extended-tip technology delivers the increased airflow of a larger compressor wheel with the lower mass of a smaller, low-inertia wheel.  The larger compressor allows higher sustained boost much higher into the rpm range. Externally there is no difference so this unit will bolt up to your OEM exhaust manifold and Cat-Fold (Catalytic converter)


K03 Super 42 - 42mm Quick Spool K03 Turbo Upgrade

This Super 42 Hybrid K03 turbocharger is engineered to be the most reliable and high-performance upgrade turbo for the Turbocharged Cooper S. This can be the number 1 upgrade for your JCW and gives you up to 260 hp. This turbo is designed to be a 'no tuning required' turbo that will add about ~ +30hp, and more with tuning!

  • Larger 42mm compressor
  • Extended tip compressor wheel
  • Designed for higher pressure
  • Upgraded 360deg bearing
  • High temperature alloy turbine housing
  • Twin scroll turbine housing
  • Water cooled bearing housing

This Super 42 upgrade high pressure high-flow dual scrolling turbo uses our big 42mm compressor to give you boost that starts early and last much longer than even the JCW turbo. This turbocharger delivers outstanding response with torque and power gains across the entire power-band and the 42mm design gives you extra boost at the top end when you need it most. If you are looking for an extreme street upgrade that delivers full race performance this is the turbo for you. It will deliver great torque, spool early, and last long. For race applications we recommend high flow / low backpressure aftermarket exhaust system which will allow this turbo to reach its full potential.

Due to the larger inlet of this Turbo, a silicone intake adapter hose is included to connect this turbo to upgraded Intake Kits.  This silicone adapter hose goes from 2" to 2.75".


If you wish to futher improve performance, here are some items you can add in the future. (These items are not included in this kit):


Additional Core Deposit is charged with every Turbo order. Core charges are refunded when a 'Rebuildable' core from your MINI is returned and inspected by the manufacturer.

All or part of the core deposit may be forfeited if the core is severely damaged and not rebuildable. The amount of core refund is determined at the discretion of the Turbo Manufacturer.

TURBO MANUFACTURER'S INSTALLATION REQUIREMENTS to validate Manufacturers Limited Warranty:

[ ] Replace the turbo oil supply line with the turbo (included with this kit)
- - - Due to excess heat round the turbocharger and particulates suspended in the turbo supply oil the oil will harden or "coke~ in the turbo and oil supply lines. If the oil supplyline is not replaced with the turbocharger the coked oil will break free from the side walls of the oil supply line and damage the turbocharger bearings. Cleaning the oil line will not help and only aggravate and increase the likelihood of the turbo failure due to coked oil breaking free form the sidewall.

[ ] Replace the catalytic converter or have it refurbished before installing a new turbo.
- - - The Catalytic converter may look clear but if any oil leaked into it some of the holes might be blocked and will cause back pressure. This starts to happen on Mini Coopers at 15k miles! Exhaust back pressure causes premature failure of the turbocharger. Turbochargers are not designed to have pressure on the exhaust side. As an alternative, have your catalytic converter refurbished to restore original flow (refurbish service included in this kit).

[ ] Prime the turbocharger when installing.
- - - No oil on the turbocharger bearings will cause failure of the bearings if they are dry even for a short period of time. Prime the new turbo with oil before you connect the oil lines.  For maximum protection, see Turbo Additive for Priming New Turbo's

[ ] Fresh engine oil with a turbocharger change
- - - Perform an oil change with full synthetic motor oil at the factory recommended viscosity when you install a new turbo. Change the oil again after one heat cycle if:  the engine is brand new, newly rebuilt, or if your MINI had a catastrophic turbo failure.


We STRONGLY recommend you change the motor oil more frequently than the factory recommendation. Anecdotal evidence suggests Turbo's with more frequent oil changes have fewer issues. We suggest 5000 mile oil change interval or less. Make sure you use FULL SYNTHETIC motor oil with the ACEA (Association des Constructeurs Europeens d'Automobiles) A3/B3 specification.

After a long or hard drive, drive 'easy' for a while just before your destination. This will reduce the engine and oil temperatures to lower operating levels. Also make a habit to let the engine idle for a couple minutes before shutting off. This will help cool the turbo preventing oil coking in the journals and bearings. Yes, the MINI has an auxiliary water pump that runs after shutdown to help cool the turbo, BUT - the oil isn't cirulating - it just sits there waiting for the turbo to cool. This is why we recommend you idle before shutdown - let the oil circulate while the temperature comes down.


Manufacturers Limited Warranty covers all turbochargers to be free of defects in materials and workmanship for normal use and service up to 1 year after retail purchase. Manufacturer reserves the right to examine any part returned for warranty claim to determine whether a defect in materials or workmanship exists in such product. Manufacturer liability is limited to repairing, replacing or crediting towards other product, and credits will not exceed the invoice total for the parts.

Labor and storage charges are not products of the manufacturer and, therefore, will not be reimbursed for any reason. Final determination of the condition and suitability of the parts for uses contemplated by the buyer and is a sole responsibility of the buyer. Manufacturer will not be liable for any damage or injury to persons or property that might be claimed as a result of improper installation or misuse of any part subjected to this warranty. No warranty claim or refund, will be given until the item is in our possession and we have processed it which can take up to 20days.

Before installing any of our products it is the responsibility of the installer/owner to fix or resolve any and all problems that cause the original part/item to fail and can cause the new part/item to fail. Since we do not troubleshoot, we take no responsibility for incorrectly diagnosing the issue that caused the initial part/item to fail. There are no warranties expressed or implied beyond those set forth above.


Take a look at these informative videos that will help you avoid potential pitfalls with the Turbo:

How to Kill a New Turbo Part 1 - Oil Line

How to Kill a New Turbo Part 2 - Catalytic Converter

How to Kill a New Turbo Part 3 - No or Low Oil

How to Kill a New Turbo Part 4 - Using the Correct Oil

NOTE: Some states (like California) have ever tightening requirements for emissions testing and inspections. Always check your local regulations on compliance for street use.